Adenoviruses: The Nature of the Virion and of Controlling Factors in Productive or Abortive Infection and Tumorigenenesis; Replication of Reovirus; Nucleic Acids of Tumor Viruses; Some Aspects of the Interaction between Polyoma Virus and Cell DNA; Insect Tissue Culture and Its Use in Virus Research; Seed Transmission of Plant Viruses; Plant Virus Classification.